Nagami Suzuka, a brilliant third-year middle school student and student council president, pens a novel about an overly affectionate little sister towards her brother. Surprisingly, the novel wins a prestigious light novel award. However, instead of Suzuka, her older brother Yuu steps in as the proxy author under the mysterious pseudonym Towano Chikai. Follow their intricate journey through volumes 7.5 and 8.5 as they navigate the world of light novels and sibling bonds.